There is a tree outside my window that is frequented by bees. Any time I look outside there are at least a few bees flying from leaf to leaf, and stopping to walk around the leaves that they land on (see Photo). I've seen individual bees continue this behaviour for a while. Why are they doing this?Charlie F, Berkeley, California, US
I travelled to Scotland recently where I took this picture of an organism (see Photo). It was smooth, glossy and transparent like melting ice, and quite hard to the touch. It was not alone; there were four others close by, the biggest of which was about 20 centimetres across. Can any reader tell me what it is?Alexander Markov, London, UKThere are lots of ideas about what this object is, none of which are conclusive. It does seem as though there is an army of different jelly-like objects invading our coasts. Check out "Lump life" from The Last Word of 24 July 2004 - Ed
In a box of childhood rubbish, I discovered a rubber pencil eraser and a plastic disc - once fired out of a toy Klingon spaceship - that over the years had somehow welded themselves together (see Photo). There was some transitionary rubber/plastic substance at the join. How did this happen?Stephen Battersby, London, UK
Some evenings the sunset is stunning while on others it is only so-so, even though the sky is cloudless in both cases. What causes the difference?Ben Wagstaff, Northallerton, North Yorkshire, UK
In hot weather dogs keep cool by panting. If I were to do this I would hyperventilate and exhale too much carbon dioxide. How do dogs avoid the effects of respiratory alkalosis?Andrew Benton, Birkenhead, Merseyside, UK
It is an accepted fact among Australian beer drinkers that a glass of cold draught lager holds its head for longer if the beer is pulled in two or three separate pours rather than in one continuous pull. What causes this effect and does it also apply to beers served at cellar temperature?Justin Swain, Gladesville, New South Wales, Australia
Where on our planet is the furthest point from any sea? I'm hoping it is in the middle of Asia somewhere because I'm travelling that way soon, and want to stand at that point in swimming trunks, snorkel and mask.Hugh Jones, Slapton, Northamptonshire, UK
On a long motorway journey while driving behind a horsebox, I wondered, do horses get travel sick? In fact, do we know whether any animals besides humans suffer from motion sickness?Neil Bowley, Newthorpe, Nottinghamshire, UK
During summer, if I drive my car in Europe the windscreen is splattered by dead insects. However, I can drive for months in the Caribbean without any insects striking the screen. Are Caribbean insects smarter?Erik Blommestein, Trinidad and Tobago